I also did notice it after some time (I had 3 weapons, that needed to be fixed, so 3 icons were somehow more eye-catching) Honestly, the one axe on the top would also confuse me (as it may represent something like "flag" or symbol of blacksmithing ... )As I had three, I started to think "are these some sort of tabs, let's try clicking them if something will get changed"... Also I had to notice that the button on the right got active (where you can haggle about the price). So don't worry, you are not the only one who nearly missed that :)